sima

名词 n.
中文释义

英文释义

名词 n.
  1. The upturned edge of a roof which acts as a gutter; a cyma.
  2. The lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium. uncountable

词形变化

simas plural

词源

词源 1
From the Ancient Greek σιμός (simós, “bent upwards”).
词源 2
Coined by Eduard Suess in 1909, in Das Antlitz der Erde, as a blend of silicon + magnesium.
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